Keyword density is one of those numbers people either obsess over or ignore completely. Neither reaction is much use. It is a diagnostic, not a target — a quick way to see whether a page actually talks about the thing it is meant to rank for, and whether it does so like a human or like a spreadsheet.
What keyword density actually measures
It is the number of times a word or phrase appears, divided by the total word count of the page. If “technical SEO audit” appears six times in a 1,200-word article, that is 18 keyword words out of 1,200, or 1.5%. There is no secret formula behind it, and no threshold Google publishes.
The range worth aiming for
In practice, pages that read naturally tend to land between 0.5% and 2.5% for their main phrase. Below that, the page often has not committed to a topic. Above 4% and it usually reads badly — which is the real problem, because thin, repetitive copy loses to better-written competitors long before any penalty enters the picture.
- Under 0.5% — the topic is too diluted. Tighten the page, or split it into two.
- 0.5% to 2.5% — healthy. Leave it alone and spend the time on intent and internal links instead.
- Over 4% — read the page out loud. If you wince, rewrite it.
Check phrases, not just single words
Single-word counts are noisy. “SEO” will always top the list on an SEO page and tells you nothing. The useful signal sits in two- and three-word phrases, because that is closer to how people search. A page targeting local SEO services that only ever says “SEO” in isolation is not really covering the query.
A faster way to run the check
Counting by hand is tedious, so I built a tool for it: paste your text or HTML into the keyword density checker and it returns one-, two- and three-word phrase counts with the density for each, plus a flag on anything sitting outside a sensible range. It strips tags, so you can paste a page’s source straight in.
What to do with the number
Treat it as a prompt to reread, not a dial to tune. If the density is low, the fix is almost never to sprinkle the phrase in — it is to add a section that genuinely covers the sub-topic you skipped. If it is high, the fix is to cut. In both cases the edit that helps the ranking is the same edit that makes the page better to read, which is a reliable sign you are working on the right thing.